OnePlus 3, 3T has easter egg in calculator, cool but nothing special - Android Community
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Note app & Calculator app
Peter van Dijk on Twitter: "The OnePlus calculator helpfully inserts periods every 3 digits for readability. This works very well. (The output number is an integer; one of the inputs is not.)
OnePlus Launcher – Apps on Google Play
There's a hidden easter egg in OnePlus' Calculator app - Pixel Spot
Download OnePlus Calculator App Latest Version [Old Versions Archive]